Dave - thanks for your pictures. I am in the process of rebuilding the PS Box on my 1966 230SL and the photos are helpful. Did you ever write up or find any disassembly instructions? I found those for the manual box, which is helpful, but not the power box. Do you have a seal kit number/supplier that you can share? I can't remove the input unit because the valve assembly seems to be interfering. Looks like the valve assembly needs to be removed first but I'm not certain how to do that.
Thanks,
Harry